Considering that we use it as a segulah, I always feel guilty pouring the wine that was used to extinguish the flame into the drain or discarding it in the trash. I once saw an old chashuv Rov pouring it outside his front door onto the ground, but I haven’t seen a written source for this, so I don’t know the significance of this. What do you do with it?
For a second there, I thought I missed the answer to my question when I searched the CR archives before posting this question. I actually clicked on your link before realizing… Lol